Added filters demo

Author: PixelsCommander

README.md

@@ -39,6 +39,7 @@ No DOM + WebGL rendering = highest FPS possible for Web platform
 Demos
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+- [Filters](http://pixelscommander.com/polygon/htmlgl/demo/filters.html) WebGL is not only about performance. It breaks any HTML/CSS limits in terms of animations and interactivity
 - [Basic HTML GL](http://pixelscommander.com/polygon/htmlgl/demo/basic-webgl.html) demo shows how to use HTML GL and animate GL Elements. It also demonstrate that HTML GL handle content change events and repaints element`s WebGL representation
 - [Basic DOM](http://pixelscommander.com/polygon/htmlgl/demo/basic-dom.html) this is the same project as previous. The only difference is that htmlgl.js is not included
 - [Advanced content HTML GL](http://pixelscommander.com/polygon/htmlgl/demo/advanced-content-webgl.html) slider with nested content rendered via WebGL and animated, ability to drag with mouse horizontaly, click event listeners on boxes